<article id="wikiArticle">
<div></div>
<h2 id="Summary" name="Summary">概述</h2>
<p> <code><strong>Math.sinh()</strong></code> 函数返回一个数字(单位为角度)的双曲正弦值.</p>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre><code class="language-javascript">Math.sinh(<em>x</em>)</code></pre>
<h3 id="Parameters" name="Parameters">参数</h3>
<dl>
<dt><code>x</code></dt>
<dd>任意数字 (单位为度).</dd>
</dl>
<h2 id="Description" name="Description">描述</h2>
<p>双曲正弦的图像如下:</p>
<p><img alt="" src="http://upload.wikimedia.org/wikipedia/commons/1/17/Sinh.png" style="height: 300px; width: 300px;"/></p>
<h2 id="Examples" name="Examples">示例</h2>
<pre><code class="language-js">Math.sinh(0)      // 0
Math.sinh(1)      // 1.1752011936438014
Math.sinh("-1")   // -1.1752011936438014
Math.sinh("foo")  // NaN
</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-math.sinh" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Math.sinh</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>Initial defintion</td>
</tr>
</tbody>
</table>
<h2 id="Polyfill">Polyfill</h2>
<p>该函数可以使用 <a href="Reference/Global_Objects/Math/exp" title="Math.exp() 函数返回 ex，x 表示参数，e 是欧拉常数（Euler's constant），自然对数的底数。"><code>Math.exp()</code></a><code> 函数来实现</code>:</p>
<pre><code class="language-js language-js">function sinh(x){
    return  (Math.exp(x) - Math.exp(-x)) / 2);
}</code></pre>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div><p></p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #f00;">未实现</span></td>
<td><a href="/en-US/Firefox/Releases/25" title="Released on 2013-10-29.">25</a> (25)</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td>25.0 (25)</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also" name="See_also">相关链接</h2>
<ul>
<li><a href="Reference/Global_Objects/Math/acos" title="Math.acos() 返回一个数的反余弦值（单位为弧度），即："><code>Math.acos()</code></a></li>
<li><a href="Reference/Global_Objects/Math/asin" title="Math.asin() 方法返回一个数值的反正弦（单位为弧度），即："><code>Math.asin()</code></a></li>
<li><a href="Reference/Global_Objects/Math/atan" title="Math.atan() 函数返回一个数值的反正切（以弧度为单位），即："><code>Math.atan()</code></a></li>
<li><a href="Reference/Global_Objects/Math/atan2" title="Math.atan2() 返回其参数比值的反正切值。"><code>Math.atan2()</code></a></li>
<li><a href="Reference/Global_Objects/Math/cos" title="Math.cos() 函数返回一个数值的余弦值。"><code>Math.cos()</code></a></li>
<li><a href="Reference/Global_Objects/Math/tan" title="Math.tan() 方法返回一个数值的正切值。"><code>Math.tan()</code></a></li>
</ul>
</article>